(1) The presented book Elementary Mathematics written as lucid manner, which will be very helpful for the candidates of competitive exams. (2) This book has a perfect blend of theory, practice questions, and discussions in the chapters are supported by updated facts, figures, diagrams and tables. All the chapters followed by an exercise with answers and explanations. (3) The book contains specific 15 Topics which form a part of most of the competitive examinations. This book mainly focuses on high level questions of Numbers and Fraction, LCM and HCF of Numbers, Simplification, Average, Percentage, Profit, Loss and Discount, Ratio and Proportion, Time and Work, Time, Speed and Distance, Simple and Compound Interest, Mensuration, Geometry, Trigonometry, Algebra and Data Interpretation. (4) The book covers a many of questions from the past competitive exams. This book is a must for all SSC, CGL Tier-I, Tier-II, CPO, Banking, Railways and other competitive exams.